Elastic tire



March 24, 1925.

F. A. WILSON ELASTIC) TIRE Filed March 21, 1924 2 Sheets-Sheet 1 Gi E WNW Mat-ch24, 1925. 1,531,6 6

F. A. WILSON ELASTIC TIRE Filed March 21, 1 24 2 huts-Shah 2 45 and shows the recesses or depressions mould Patented Mar. 24, 1925. i

FREDERICK .ALIREI.) WILSON, OF LONDON, ENGLAND.

ELASTIC TIRE Application iuea March 21, 1924. warm. 700,801."

To all whom it may concern:

Be it known that I, FREDERICK ALFRED WILSON, a Britishsubject, residing at London, England, have invented certain new and useful Improvements in Elasticf'lires;

. and I do hereby declare the following to be a full, clear,'and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same. I l f M This invention relates to road'vehicle elastictires of the kind in which the load-sup porting side walls of the tireare of gablelike section which becomes distortedu'nder load, and the object of the invention is to render such tires more suitable for compara tively light motor or other road vehicles,

' and to provide an improved tire structure.

According to the present invention the gable-like side-walls] are formed with series of interspaced recesses or depressions of suitable s'hape, both upon their internal faces and upon their external faces, the depth of these depressions being for [example approximately one-half ofthe thickness of the walls. l i The adjacent depressions or recesses in each wall are spaced apart at intervals which allow between them a distance pref erably not less than the circumferential length of the depressions. vThe depressions or recesses in the inner face of one wall are spaced alternately between those inthe outer face of the same wall, and similarly the depressions in one side wall are preferably spaced alternately of those in the'other wall.

The recesses or depressions are with advantage of semi-ovoid shape, being deeper and broader towards the tread, and shal lower and narrower towards the base".

The invention is hereafter described with reference to the accompanying drawings, in

which r r r L Figure lvis a cross'section of a "11113 made in accordance with the present j mvention ed in the side walls of the tire, which is mounted. upon a demountable rim of suitable construction; r a

Figure 2 is a plan'of one-half ofth'e tire illustrated in Figure 1. I l

, Figure 2? "s a view, partially in plan and partially in section, taken on the line 22 of'Figure l.

Figure 3 is a fragmentary perspective v view of the tire alone. V

rower towards the base B.

The tire has the side-walls a of its gable"- like section formed with recesses or, depressions b,- these'side-walls connect together the curved tread A and the base B, and are shown with the inner'faces of the side-walls moulded to a convex shape at (1: The tire is shown provided with outer beads A and inner beads A the latter being designated hooking base beads whereby the base of the tire may be engaged by the clinches D D of'the wheel rim D. The recesses b are preferably arranged alternately on the outside and on the inside of the side-wall, and between the recesses b a portion of the wall remains of full width (see FigureIQ), this portion being of a circumferential length not less but preferably rather greaterthan that of'the recesses, as indicated by the respective distances a: and y in Figure 2.

tobe a series of rectangular rubber pillars of length gt, joined together by fluted rubber websof the lengthy. The recesses b on the opposite side-wall of the tirecorne in the centre of the solid first side-wall, as seen by comparison of Figures 2 and 2 The recesses 'bmay be of any suitable shape, and cross-section; preferably, as seen in Figure 3, they are semi-ovoid, being deeper and broader to- In fact, underthe tread 'theremay be said I Y parts'or pillars in the wards the tread A and shallowerv and nar- The outer and inner shelving ends of the recesses vordepressions b on the outer faces of the side-walls merge into the adjacent portions of the tire, the former ends being tangentialto the curve at the root of the tread A, and the opposite ends 6 being continuous with the faceof the outer bead A? of the tire as seen in Figure 1. The recesses or depressions on the inner faces of the sidewalls'are of similar shape. I Y a The recesses 6 allow of the lateral spewing of the rubber in the walls of the tire on deformation under compression, but if the recesses were formed on only one side of the wall, there would be on the other side a continuous wall of rubber whichon deformation would not have the same facilities for spewing, and consequently uniformity of action wouldnot be obtained ithas therefore been found highly desirable to provide recesses 12 on both sides of the Walls 04 as now disclosed and shown; i j v The recesses b; being at]; broader and deeper near the tread A than at 6 near the v at intervals around lthefelloe base 13 of the tire, the connecting was 61' Webs left by them are thinner near the tread, and similarly the pillars. 00 Which theyeeit nect are narrowerandTo-f smaller-1 sectional area near the tread A than near the base B; in other Words the pillars and their connecting Webs y just under the tread are of smaller sectional area andar'e more sensitive to deformation than towards the base of the'tire; becdmin less 'sensitiveyas'they'aproachahe basefi. s a I Q j The base Bof't'he tire isshownf irotided with inwardly directedfand facingfed gs a} 0? which eXieiidiiivv rdIy r h hollow tire beyond the ends of the sidefiifalls nearest to the annular .rinaD. i. This rim is si i wii 1divid'ed circnfmferentially and it coinpiisest'e clinches D each half beingf'shovi lifse cured; as by rivets D tofan *a'n ii largiaee plate D3, the two face-plates D? adapted it be seemed mire-wheel; ieui ie n means of transverseboltsfas DP,

through holes D in the face-plates v endless metal retaining rim" d is floalte'd bn the edges 0'0? inside the tire'baseBjbefore fitting the tire over the Wheel felloe before securing thefsecond of the clinches D D in position on the corre ding hooking bas'ebe'a'd 'Ilhe'retaihfing rim d res'ts in roove e thefedge's of wliieh are separatedfrom the convexity a "breath side-Wallby a circi'inifereritia r i'b"f, As result of this method of construction the carrying 'poWerof the tireis not weak, ened in fall proportion totheredudtiohof area of rubbenjand further there is obtained a structure orfbacking behindthdtjrea'd' which Will yield readily and s nsitively-fro light loads biit offers greater'and gr'eat'ei jresistance to deformation "as the load 'con't'in' iies to increase.

he ftire 1" therefore better adapted ffor carrying comparatively light loads ajthigher speeds, ithouthny liabilityto rolling or lateral deflection in relation tothewheel.

It will be understood that a siinfilar effect can be obtained by the provision of s'iiit ailfle excrescences uponjthe faces of iilldjlIB-fWtlljS,

such excrescences being the 'conve'ise'of the Anelastic tiie bf gfiblelile sect ra som 1' iii; 'a "tread, "a base hort'ion, and side "Wall'sconnecting said tread and. base, said side walls having aISeI'leS fof interspaced recesses upon their external faces and a secbnd series of interspaced recesses upon their internal faces, and each said series of reces'ses bein'g'.s1iaced afiart at intervals which allow between recesses on the same side wall a distance not less than. the circumferential sting said trea ase tage, said -"i1,';'"a series interspaiced I'einternal "messiah-ii each series of inters 'iaced cesses e in th c'e of'fine side wall a lternatebe twee t oseinthe other faceof fthe "sani'e sidewaliiff areiir;git e;1ike sateen,

compr I acha base ortijongandside We, e gsaid treadajiid basef'each o f saifd side fwalls fhaying a "series fof interspaced recesses I ri es ofintrsfi aced recesses "upon its 'i te' a1 fiaee, saidfseriesfof recesses be i d -n biie side wallfthat they alternate;

wialioffjt t n s f h low astictire for'i ehicles,comfirisin'ga tread 'p oi tion, "a base portion, and side alls connecting said tread and'base tier 'f'on'sfeach ofsaid side Walls having series of'iecessesfiiponf fith its internal face J ternal race said "recesses "in""'eaeh side; il bein' pacedjapart at intervals hie-h a low betwee them 5a "di tanc {not less "than the circiiinfeiential lengthfof the recesses, said 'r'ej a dineach" side wall lifion'theiriternalaiid v ernal faces of that wallbein se arated by wa'llgfportions'of the 7 f 'll se'ctional thef'walliand iota-"circi inferential length "not lessf'tlian'tliat of eitheroftlieadjaeent'recesses I w '6. A 'h "ollo'wf"elastic tire'ffor vehicles, coin prising'a'tre d"'a base portioh,'aiidsidewalls con'nejc'tiiigf'saidtread Tand base portions,

eachefsaid side Walls having interspaced ing so arranged "'th'at the recesses onitsekterrial"face and I recessesupon its external andinternalfa'ces',

and saidrecesses' of semi-ovoid shape and deeper aiidfbroader owards the'tread,

shallower and "narrower towards the 7. Aho-llo'w elastic tire for vehicle Wheels, comprising acurved tread portio nfa base portion "With beaded "edges, side -Walls; {connecting said tread and" base portions; each offsaid side "walls"hai ingii1terspaced recesses iipon its external and internal faces,

said recesses being of semi-ovoidsh'ape with their deeper and "broader ends towards the tread, the recesses upon the eizternal faces of said side walls having their outer and inner shelving ends merging into the adjacent portions of the tire, each of said outer ends being tangential to the curve at the root of the tread and each of said inner shelving ends being aligned and continuous with the face of the outer bead of the tire.

8. As a new article of manufacture, a hollow elastic tire for a road vehicle wheel, comprising a tread, a base portion, inwardly directed and facing edges to said base portion, and side walls connecting said tread and base portions, said side walls having interspaced recesses upon their inner faces and also interspaced recesses upon their outer faces, the inner and outer recesses on each side wall being staggered,

and the alternate recesses being separated by circumferential lengths of side wall which are greater than the circumferential length of the recesses.

In testimony whereof I aflix my signature.

FREnERicK ALFRED WILSON. 

